22100-0E020 Denso Hp3 / Hp4 Pump Plate – Feed Pump Plate For Common Rail Rebuild

When the Denso HP3/HP4 supply pump enters its fifth or sixth thermal cycle from cold start to peak operating temperature, the feed pump plate that separates the trochoid rotor housing from the high-pressure plunger block begins to surrender its original flatness. The result is a progressive increase in rotor end clearance-measured in hundredths of a millimeter-which directly reduces the pump's volumetric efficiency at cranking speed and causes rail pressure undershoot during tip-in. This 22100-0E020 pump plate is machined to restore the factory geometric reference between the feed pump stage and the plunger cavity, resetting the axial alignment that the ECU's feed-forward maps assume.

If the original plate's surface deviation exceeds 0.02mm across its sealing diameter when measured with a dial gauge and granite surface plate, the feed pump plate must be replaced. This 22100-0E020 replacement is ground to a flatness tolerance within 0.01mm and a surface roughness of Ra 0.8μm or better. The four mounting through-holes are bored with a positional concentricity of 0.015mm relative to the plate's outer pilot diameter-ensuring the Denso HP3 pump plate does not introduce a side-load vector during bolt torquing. Thickness is held to 5.0mm ± 0.05mm for HP3 and late-production HP4 applications; early HP4 plates measure 5.1mm. For non-standard pump variants, the supplier accepts drawing- or sample-based confirmation orders with a 15-working-day lead time for first-article inspection reports.

Should you need to verify fitment against a pump nameplate, this plate accepts the following 294000-series pump assemblies: for the HP3 platform-294000-0019, -0047, -0200, -0259, -0369, -0380, -0462, -0490, -0560, -0610, -0700, -0750, -0840, -0920, -0990, -1200, -1300, -1410, -1510, -1660, -1730, -2050, -2130; for the HP4 platform-294000-0030, -0196, -0265, -0294, -0570, -0581, -0630, -0670, -0690, -0730, -0822, -0960, -1180, -1190, -1290, -1460, -1620, -1720, -1810, -1820, -1840, -1950, -2600. The Denso part number mapping for the plate itself is 294183-0050, though service listings sometimes cross it to 294183-0030 or 294183-0160 depending on production batch. This item is stocked under the supplier's internal inventory code FPP-22100E020-B-reference this when placing replenishment orders.

Before the old plate is lifted, mount a dial indicator on the pump body and check the inner shoulder that registers the plate's outer diameter. A TIR reading exceeding 0.04mm indicates housing bore ovality that no new plate can correct-this condition must be disclosed to the customer prior to rebuild. All bolt threads must be chased with an M6x1.0 bottoming tap, and the blind holes cleared of residual cutting fluid or debris. The tightening sequence follows a cross-pattern in two stages: 8 N·m for the initial pass, then a final pass to 14 N·m ± 0.5 N·m. Overtightening beyond 16 N·m will distort the plate's flatness by as much as 0.025mm across the diagonal axis. After installation, the trochoid rotor end-play must be rechecked through the feed pump cover access port-the acceptable range is 0.04mm to 0.08mm, measured with the plate bolts at full torque.

Fitting this 22100-0E020 plate at the 400,000-kilometre preventive overhaul point preserves the drive shaft journal clearance by maintaining rotor concentricity, which keeps the feed pump's volumetric efficiency above 92% across the entire engine operating range. The common rail pump rebuild cost-benefit calculation should consider that stable feed pressure directly improves plunger chamber fill rate-a 0.05mm increase in rotor end clearance reduces fill volume by approximately 3% at cranking speed. For wholesale buyers, the recommended safety stock level is calculated as: average monthly sales volume × replenishment lead time (weeks) × 1.5 buffer factor-for a distributor moving 200 units per month with a 4-week lead time, the safety stock target is 200 × 1 × 1.5 = 300 pieces on hand at all times.

Q1: What is the MOQ ladder structure for this pump plate, and how does unit pricing scale?
Tier 1: 1–49 pieces at standard list price. Tier 2: 50–199 pieces with a 12% discount. Tier 3: 200+ pieces with a 20% discount. All tiers are FOB shipping point, with freight prepaid on orders exceeding 500 pieces.

Q2: How is batch-to-batch consistency verified, and what third-party certification is available?
Each production batch is sampled per ISO 2859-1, General Inspection Level II, with AQL 1.0 for critical dimensions (flatness, thickness, bore concentricity). A third-party dimensional inspection report from SGS or Bureau Veritas can be included upon request at the buyer's cost.

Q3: Can I mix this plate with other pump plate versions in a single shipment without affecting warranty coverage?
Mixed-batch shipments are permitted, but each batch must be clearly identified by the laser-etched code on the plate edge (YY-WW-xxxx format). Mixing different production lots within the same engine rebuild is not recommended-the supplier will not accept warranty claims where mixed-batch installation is proven to have caused the failure.

Q4: What are the recommended storage temperature and humidity limits for wholesale inventory?
Store in the original VCI-coated packaging at 5°C to 40°C, with relative humidity below 65%. Avoid direct contact with concrete floors-use pallet racking. The corrosion protection period is 24 months from sealing under these conditions. Once opened, install within 72 hours or apply a light oil film.

Q5: When does the warranty period commence-at shipment date, delivery date, or installation date?
The warranty period starts from the shipment date from the supplier's warehouse, not from the date of installation. This is to prevent ambiguity in long-term storage prior to fitting. The standard warranty is 12 months from the shipment date.

Q6: How can I distinguish this new-manufacture plate from a remanufactured or used part on the bench?
New plates carry the supplier's logo and batch code laser-etched on the outer edge between the 1 o'clock and 3 o'clock mounting holes. Remanufactured parts typically show evidence of prior torque marks on the bolt-hole seating faces and lack the factory-applied rust-preventive oil film. The packaging is also distinct-new parts are sealed in a vacuum bag with a desiccant sachet; remans are usually supplied in plain bubble wrap.

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